I need asphalt circletrack help!!

Shocks, Springs, Brakes, Frame, Body Work, etc

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Unkl Ian
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Re: I need asphalt circletrack help!!

Post by Unkl Ian » Mon Sep 03, 2012 12:28 am

Are you allowed to run a bar on back ?
Please help make Speedtalk a Troll free zone.

Unkl Ian
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Re: I need asphalt circletrack help!!

Post by Unkl Ian » Mon Sep 03, 2012 12:34 am

72firechicken wrote: HAD ABOUT 300 LB WEIGHT ON LR SOME IN FRONT OF THE AXLE A SOME BEHIND.


Rear % help under braking, also helps on acceleration.

Do the brakes get red during the feature ?
Front only ?
Or all 4 ?

Ideally, all 4 get red at the same time. But it takes an experienced driver to do it.
Most people run more front brake, which creates a slight push under hard braking.

What are the brake temps like after a heat race ?
Front and rear ?
Please help make Speedtalk a Troll free zone.

Unkl Ian
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Re: I need asphalt circletrack help!!

Post by Unkl Ian » Mon Sep 03, 2012 2:12 pm

AND, you might need a stiffer RF spring.
Please help make Speedtalk a Troll free zone.

72firechicken
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Re: I need asphalt circletrack help!!

Post by 72firechicken » Mon Sep 03, 2012 2:44 pm

Ok checked my shock trvel indicators. shock compression is 2 1/4" rr, 2"lr, rf 2 3/8", l/f 1 3/4". I am not sure how much they extend, during braking/acceleration. Thayt is something i have yet to check.

Unkl Ian
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Re: I need asphalt circletrack help!!

Post by Unkl Ian » Mon Sep 03, 2012 4:36 pm

72firechicken wrote:Ok checked my shock trvel indicators. shock compression is 2 1/4" rr, 2"lr, rf 2 3/8", l/f 1 3/4". I am not sure how much they extend, during braking/acceleration. Thayt is something i have yet to check.

RF 2 3/8" at the shock, depending on exactly where
the shock mounts on the lower arm, your wheels travel could be 3 - 4+".

I would pull the RF spring, and use a floor jack under the tire,
to figure out how much the wheel travels to produce 2 3/8" at the shock.
Please help make Speedtalk a Troll free zone.

Unkl Ian
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Re: I need asphalt circletrack help!!

Post by Unkl Ian » Mon Sep 03, 2012 4:39 pm

72firechicken wrote:Ok checked my shock travel indicators. shock compression is 2 1/4" rr, 2"lr, rf 2 3/8", l/f 1 3/4". I am not sure how much they extend, during braking/acceleration. That is something i have yet to check.

Check to make sure the shocks are not "topping out" at any point.
That unloads the tire(s) real bad.

The shocks should be in the middle of their travel at ride height.
Please help make Speedtalk a Troll free zone.

fast_crew
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Re: I need asphalt circletrack help!!

Post by fast_crew » Tue Sep 04, 2012 9:37 pm

Being that the banking is fairly low,(car will want to roll more then a high bank) I would say start with a RF spring about 100lbs stiffer then LF. This should reduce roll, wheel travel , and help bite off. Reduce stagger an inch or so, and get the cross weight up abit.
Josh K.

Unkl Ian
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Re: I need asphalt circletrack help!!

Post by Unkl Ian » Wed Sep 05, 2012 6:08 pm

72firechicken wrote: tires are hoosier 700 8 inch grooved
tire temps after 6 lap practice had to get to pit stall and then check them

FRONT
/|\
142 147 152 | 157 156 160
|
|
LT----------------RT
|
|
|
155 158 156 | 196 197 186
|
REAR

What does Hoosier recommend for tire temps ???
Please help make Speedtalk a Troll free zone.

65hardtop
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Re: I need asphalt circletrack help!!

Post by 65hardtop » Mon Nov 25, 2013 9:16 am

Holy cow! a lot of people I know are running under 600# front springs in the front of a stock sub car. Big bar soft spring setup is the way to go. We started using double the size diameter sway bar we used to. On coil over late models right around 200# fronts with 1 7/8s diameter sway bar. That was a few years ago. Most of the fast guys are on bumps around here. And some coil bind setups. That's another animal though. One of the fastest guys I know was consistently in the 130-140 range on his tire temps all the way around his car. Leaf spring rear is something I'm not used to on a pavement car. Most are 3 link.

edsantiago
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Re: I need asphalt circletrack help!!

Post by edsantiago » Tue Mar 04, 2014 2:02 pm

Way too much tire stagger. It'll slow you down in the straights, keep the RR to hot and lose available traction coming out of the turn and probably feel and be loose all the way around the track. Assuming you run a locked rear end. Sounds like your trying to make chassis adjustments when your rear tires are trying to make you do donuts. Anytime a car is trying to spin out on you it will feel like it's rolling over too much. Shock travel indicators don't sound horrible. Also incorrect RF shock and LR shock can make or break you.

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